Petrunin, Kristin Firmery. The Teaching of 21st Century Skills through Project-Based Learning and Professional Development for Career and Technical Education, dissertation, December 2019; (https://digital.library.unt.edu/ark:/67531/metadc1609129/m1/1/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .

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